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By: Esterline Research & Design  02/03/2015
Keywords: Quartz Crystals, Quartz Crystal, Frequency Control

Temperature Compensated Crystal Oscillators (TCXOs) are widely used and well known frequency control products. Their performance has improved over the decades with the advent of newer and improved technologies. Evolution of the TCXO from resistor thermistor networks to modern polynomial generators has pushed TCXO temperature stabilities to nearly +/-100ppb deviation over the industrial temperature range of -40 to +85°C. Even with these great advances, users always need tighter stabilities. This paper focuses on a new temperature compensation technique for crystal oscillators. Through the use of an Artificial Neural Network (ANN), temperature compensation of AT cut crystal oscillators can be achieved with better than +/-10ppb stability over the industrial temperature range (-40 to +85 °C). This is more than a 10 fold improvement over state of the art polynomial function generator compensation. The theory of this compensation method will be discussed, and data showing the results of temperature compensation on actual oscillators will be presented. Published in: Frequency Control Symposium (FCS), 2012 IEEE International Date of Conference: 21-24 May 2012 website: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6243582&searchWithin%3Dp_Authors%3A.QT.Esterline%2C+J.C..QT.

Keywords: ANNCXO, Clock Oscillator, Crystal Oscillator, Crystal Oscillators, Frequency Control, Frequency Control Products, Quartz Crystal, Quartz Crystals, Voltage Controlled Oscillator,

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John Esterline is the CEO of Esterline Research and Design, LLC, a Pennsylvania based start-up company. John holds an MEngEE and a BSEE from Pennsylvania State University. His research interests focus on temperature compensation algorithms for the improvement of embedded time bases. John is the inventor on two US patents (US8188800 B2, US8525607 B2), and the inventor of one patent pending (US 13/570,563). Esterline Research and Design, LLC offers consulting services in frequency control, test an


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Based in Central Pennsylvania, Esterline Research and Design is an electrical engineering design firm with an emphasis in the frequency control industry. Our expertise comes from the design and testing of high precision crystal oscillators, for military and commercial applications. Our team has a combined 70 years experience in every facet of oscillator design and testing. The team's primary research interests are the improvement of embedded time bases, including all aspects of design, manufactu